A few weeks back, I joined the Mythras discussions on Discord. And it has turned out to be a friendly community dedicated to all things Mythras - including M-SPACE and Odd Soot.
If you are new to Discord, it's best described as a huge group chat. You can write text messages, upload images and files and join voice chats. So far, I've only used the text chat, but it's been a very pleasant and creative experience. The authors writing for M-SPACE - Alex Greene, Scott Crowder and Mike Larrimore - have joined the discussions and answered questions. And I try to check any new posts daily.
You can get Discord here: https://discord.com
Join the Mythras server with this link:
Discussions are divided into several channels. M-SPACE and Odd Soot appear about halfway down.
I hope to see you there!